Malicious PDF — malware analysis report

Static analysis result for SHA-256 20806b9aafc9415e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 17:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74dab560b9ca469cdf0d004cd40e0043 SHA-1: 47a18095e59bf8ce0bf484267bc4b58f3324fdba SHA-256: 20806b9aafc9415efe65a3f507802d6802e0ee40327ef48e803b781782508516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bahia-group.com/ckfinder/userfiles/files/sobarowuvuzegudubivoj.pdf In PDF document text
    • http://ajwatravel.com/wheelmarine/userfiles/file/zevufavuwadaj.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d585b17f1b5---zoges.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fb6c3841---divegarepagulolekize.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd123a4d7d---81126379410.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4c31c5193169e46ee713ee359d7e4dd8/valubimudotop.pdfIn PDF document text
    • http://aweibel.com/Photo/file/59183640872.pdfIn PDF document text
    • http://kaies.cn/upfiles/210713223528516073anzvmn.pdfIn PDF document text
    • https://noddy.nu/images/file/nuvovavopiki.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/40872429333.pdfIn PDF document text
    • http://bjallstar.com/upload/file/zorogubigexozuw.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/zazat.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/vokuvadipafewotogeraleval.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0442b0de56---goterorewat.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/pijitofawisaxivudegeboki.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/bemuwiregabame.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rqod6p40irbutvubmm8gld1mc4/lexotaxufuzuf.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4891fbbf2b---saros.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/kebedasemep.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2a949ad9c---65337200120.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/14072702329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=long+and+short+oo+sound+worksheetsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 20176 bytes
SHA-256: ad9311e774f2d33879092e8716710de1c5dea749af71d2511ce874bbd4b9f3f2
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10624 bytes
SHA-256: e80973dfe9292e27cb6feafa2f2ad1173d3d881537d0b0538c5be2bc4354d00a
font_02_sfnt_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1